What's new in Android 4.4 KitKat (API level 19)

Google announced Android 4.4 KitKat, internally known as Project Svelte, on 3 September 2013. The release had long been expected to be numbered 5.0 and called 'Key Lime Pie'. KitKat debuted on Google's Nexus 5, and has been optimised to run on a greater range of devices, having 512 MB of RAM as a recommended minimum.